Intruder phenomena are common in practical applications of granular materials [1, 2, 3], such as blenders, plant roots, or anchoring systems. However, existing studies are either limited to small displacement regimes up to the point of failure or consider only an already established granular flow around an obstacle. Further, the intruder is typically modelled as a sphere (or disc) while in reality they are mostly aspherical, and thus the results are limited in their generality. In this work we study the pullout of a plate-like intruder by means of a two-dimensional polygonal Discrete Element Method [4]. Particles are modelled as regular convex polygons with different corner numbers and a uniform size distribution, while the plate is represented by a single rectangular particle, burried at different depths within the aggregate. During the simulation the plate is slowly pulled out with constant velocity well beyond the point of failure. We find that in the quasi steady-state regime the pullout resistance converges onto the same value for different coefficients of friction μ. We can link this convergence to the formation of the same co-moving conical structure on top of the plate bounded by the failure surfaces. This structure emerges for every value of μ and different initial sufficiently deep embedding depths. For shallow embedding depths, the failure structure cannot fully emerge and correspondingly, the pullout resistance differs. The same collapse occurs for many, but not all, micro-mechanical observables in the granular flow around the intruder. The evolution of the failure structure approximately matches with the change in sign of the curvature of the pullout resistance.